A corona rings the moon in a cloud dappled sky - Antonino Gumina imaged this from Milan, Italy on January 11, '09. ©Antonino Gumina, shown with permission.

The bluish central aureole is characteristically straw and red fringed. The corona angular size is wavelength dependent and the longer wavelength red one is larger than those of other colours. The same wavelength dependence gives us the subdued and complex ring hues.

The Lorenz-Mie simulations were made with IRIS.


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